“Slow walking speed (less than 0.8m/s or taking more than 5 secs to walk 4m); the PRISMA 7 questionnaire and the timed-up-and-go test (with a cut off score of 10 secs) had very good sensitivity but only moderate specificity for identifying frailty. This means that there are many fitter older people who will have a positive test result (false positives). For example, only one in 3 older people (over 75 years) with slow walking speed has frailty”